Hi,
D = rt 0r D/t = r
AMP Parsing Error of [400m/45sec = 8.8889mpsec]: Invalid function '=8.8889\mpsec': opening bracket expected at /home/ichudov/project_locations/algebra.com/templates/Algebra/Expression.pm line 70. .
AMP Parsing Error of [300m/33sec = 9 .0909mpsec ]: Invalid function '=9.0909\mpsec': opening bracket expected at /home/ichudov/project_locations/algebra.com/templates/Algebra/Expression.pm line 70. .